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n this chapter, we ll be examining what is, perhaps, the iPhone s defining feature: touch input. Although many devices have used touch screens over the years, the iPhone was the first to bring multitouch to the masses. It also takes a different approach to input in general. Where many have transferred desktop-style interfaces to touch-screen devices, using a stylus in lieu of a mouse, the iPhone creates a new set of conventions, swapping pointer accuracy for responsiveness, simplicity, and direct manipulation of the interface. iPhone s touch screen seems effortless to use, because Apple has spent a lot of time working out the subtle details. If you use the built-in controls, you can take advantage of this for free, but if you need to implement your own controls, paying attention to these details makes the difference between an application that is awkward and one that feels natural and iPhone-like. So in this chapter, we ll look at those details through the lens of Stage Hand, a remote control for Keynote (Apple s slick presentation package) and one of the first applications to appear in the App Store. Stage Hand required a lot of detail work for processing touch input. We ll look at why this is, how the problems were solved, and the general principles that can be applied elsewhere. We ll also put together a simple application that demonstrates a variety of touch gestures and the programming techniques behind them.

As we ve already noted, this first responder is probably a subclass of UIResponder which is the class reference you ll want to look to for a lot of responder functionality Any object in the chain may accept an event and resolve it; when that doesn t occur, the event moves farther up the list of responders From a view, an event goes to its superview and then its superview, until it eventually reaches the UIWindow object, which is the superview of App everything in your application It s useful to note that Delegate from the UIWindow downward, the responder chain is the view hierarchy turned on its head; when you re The building hierarchies, they do double duty Application Although figure 6.

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As mentioned, the standard deviation is usually more useful than the variance. Consider the following set: 11 20 40 30 99 30 50 The variance is computed by first finding the mean, which is 40. Next, the average distance each element is from the mean is computed, as shown here: D

1 shows a direct connection from the first responder to the window, there can be any numThe Window ber of objects in this gap in a real-world program Often, the normal flow of the responder chain is interrupted by delegation A specific object (usually a First Responder view) delegates another object (usually a view controller) to act for it You already saw this put to use in your table view in chapter 5, but you now understand that del- Figure 61 Events are initially sent to the first responder but egation occurs as part of the normal movement up the then travel up the responder chain until they re accepted responder chain..

Before we leave the topic of responders, we d like to mention that the first responder is an important concept. Because this first responder is the object that can accept input, it sometimes takes a special action to show its readiness for input. This is particularly true for text objects like UITextField and UITextView, which (if editable) pop up a keyboard when they become the first responder. This has two immediate consequences. If you want to pop up a keyboard for the text object, you can do so by turning it into the first responder: [myText becomeFirstResponder]; Similarly, if you want to get rid of a keyboard, you must tell your text object to stop being the first responder: [myText resignFirstResponder]; We ll discuss these ideas more when you encounter your first editable text object toward the end of this chapter.

In 2007, stuck at work late on a cold winter s evening, I was following the live blog of a Stevenote in a window on my screen the Stevenote: you know the one, where the Coming of the Jesusphone was foretold I don t generally get excited by these events I m curious to see the new toys, but I guess I don t have the same holy fervor as some of my brethren But this one was different While the Apple phone rumors had been swirling for a few days, they d truly been swirling for years to little apparent effect, and it seemed likely that, even if the rumors proved true, the iPhone would be an incremental upgrade to the iPod But no, this really was different The magic words on screen were Runs OS X.

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